1: 1.) K2CO3, 2.) SnCl2, HCl aq. / 18-crown-6 / 1.) acetonitrile, reflux, 6 h, 2.) ethanol, water, reflux, 14 h 2: BBr3 / 2.5 h / Heating View Scheme

1: 1.) K2CO3, 2.) SnCl2, HCl aq. / 18-crown-6 / 1.) acetonitrile, reflux, 6 h, 2.) ethanol, water, reflux, 14 h 2: BBr3 / 2.5 h / Heating View Scheme

boron tribromide 2.5 h; Heating; Yield given;